DOI: 10.1175/JCLI-D-15-0728.1
Scopus记录号: 2-s2.0-84991237164
论文题名: Local and remote impacts of aerosol species on indian summer monsoon rainfall in a GCM
作者: Guo L. ; Turner A.G. ; Highwood E.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 19 起始页码: 6937
结束页码: 6955
语种: 英语
Scopus关键词: Aerosols
; Atmospheric temperature
; Atmospheric thermodynamics
; Carbon
; Climate change
; Greenhouse gases
; Oceanography
; Precipitation (chemical)
; Precipitation (meteorology)
; Sulfur dioxide
; Surface waters
; Anthropogenic aerosols
; Black carbon aerosol
; Greenhouse warming
; Indian summer monsoon rainfall
; Monsoons
; Northern Hemispheres
; Sea surface temperature (SST)
; Tropospheric temperature
; Rain
英文摘要: The HadGEM2 AGCM is used to determine the most important anthropogenic aerosols in the Indian monsoon using experiments in which observed trends in individual aerosol species are imposed. Sulfur dioxide (SD) emissions are shown to impact rainfall more strongly than black carbon (BC) aerosols, causing reduced rainfall especially over northern India. Significant perturbations due to BC are not noted until its emissions are scaled up in a sensitivity test, resulting in rainfall increases over northern India due to the elevated heat pump mechanism, enhancing convection during the premonsoon, and bringing forward the monsoon onset. Second, the impact of anthropogenic aerosols is compared to that of increasing greenhouse-gas concentrations and observed sea surface temperature (SST) warming. The tropospheric temperature gradient driving the monsoon shows weakening when forced by either SD or imposed SST trends. However, the observed SST trend is dominated by warming in the deep tropics; when the component of SST trend related to aerosol emissions is removed, further warming is found in the extratropical Northern Hemisphere that tends to offset monsoon weakening. This suggests caution is needed when using SST forcing as a proxy for greenhouse warming. Finally, aerosol emissions are decomposed into those from the Indian region and those elsewhere in pairs of experiments with SD and BC. Both local and remote aerosol emissions are found to lead to rainfall changes over India; for SD, remote aerosols contribute around 75% of the rainfall decrease over India, while for BC the remote forcing is even more dominant. © 2016 American Meteorological Society. 资助项目: NERC, National Eye Research Centre
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50233
Appears in Collections: 气候变化事实与影响
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作者单位: National Centre for Atmospheric Science, University of Reading, Reading, United Kingdom; Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Guo L.,Turner A.G.,Highwood E.J.. Local and remote impacts of aerosol species on indian summer monsoon rainfall in a GCM[J]. Journal of Climate,2016-01-01,29(19)